I don't mean on the side of the door, but on the front of the door. As someone coming in would have pushed the door open. Massei says, Knox put her hand against the door and left a mark. The dribble on the side is only a remainder of that mark. Cleaning the front of the door could have left the unnoticed dribble on the side.
IDK, I wish they had done that. :banghead::banghead: